Heat closed contact grill for 5 minutes.
Meanwhile, in large bowl, combine ground turkey, parsley, onion salt, pepper and 2 tablespoons of the salad dressing; mix well. Shape mixture into 4 patties, 1/2 inch thick.
When grill is heated, place patties on bottom grill surface. Close grill; cook 8 to 10 minutes or until patties are no longer pink in center.
In small bowl, combine lettuce, cheese and remaining salad dressing; toss to mix. Spoon mixture evenly onto bottom halves of buns. Top with patties, tomato slices and top halves of buns.